The Champions League anthem has become one of football's most iconic pieces of music, sending shivers down the spine before Europe's finest do battle.

And now a 'Choir of Champions' is being unleashed on the streets across the continent by Walkers to celebrate their official partnership with the Champions League .

The undercover vocal troupe have been surprising passers by ahead of this week's final last-16 second leg clashes to help the public get readty.

A series of impromptu renditions of the classic tune were performed on buses, streets, in city squares and even by helicopter, with the Choir of Champions out in full force in Madrid, Munich and London, as Europe’s premier club competition moves into its defining stages.

Gary Lineker kick-started the day by taking to the London skies in a helicopter that flew over the London skyline projecting the iconic anthem to the masses below to start their day with a bang. The chopper then landed at London’s O2 Arena where Londoners were given a live rendition on the ground.

The Chaaaaampions, ba ba ba baaaa (Image: Getty)

The Match of the Day host said “Spreading the UEFA Champions League anthem across London was a lot of laughs. I’m not the best of singers, but hopefully I did the anthem, and the choir, some justice. It took a lot of persuading and peer pressure to get me up in the helicopter given I’m not the biggest fan of heights, but that’s the commitment I have to get everyone Game Ready!”

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